Semaglutide research found changes in weight, blood sugar, and organ health.
Begin with the clearest result, then see who was studied and where doubt remains.
What Semaglutide studies can answer for you
Used as medicine, semaglutide copies a gut hormone and has been studied for high blood sugar, extra weight, and organ illness. This page gives the main findings and the limits that came with them. The strongest result comes first.
In many trials, chance placed each person in the semaglutide or placebo group. A placebo resembles treatment but contains no drug. A fair look at both groups helps show whether semaglutide likely caused a change. That’s what gives weight to a finding such as 14.9% loss.
Some facts come from reviews or reports made after treatment, not from these trials. The page tells you when that’s true. Each number was checked against the study listed on Semaglutide references. I’d bring your main question to the next visit.
What Semaglutide did in the main liver study
The clearest liver study included 1,197 adults with MASH, a liver illness caused by fat and swelling. This was phase 3, the last large test before wider use. Their liver scars were beyond the early stage but hadn’t reached the worst stage. Doctors confirmed the illness in a tiny liver piece, then gave people 2.4 mg each week or placebo.
With semaglutide, liver swelling cleared without worse scars in 62.9%. That happened in 34.3% of the placebo group. The 28.7 percentage-point gap was very unlikely to be due to chance [8]. Scars also eased in 36.8% versus 22.4%, a 14.4 percentage-point gap [8]; that gap was also unlikely to be luck, though many people didn’t improve over the study period.
MASH may cause no signs that you can feel. Doctors found the changes by checking liver pieces before and after treatment. The result supported the medicine’s 2025 use for MASH. One study still can’t predict your result.
What Semaglutide weight loss looked like over time
STEP 1 gave the best-known weight result. Adults without diabetes received 2.4 mg by weekly shot. At week 68, average weight fell -14.9%, compared with -2.4% on placebo [1]. A related report appeared in the Lancet [10].
People kept much of the loss while treatment continued for two years. STEP 5 found that the drop lasted and was large enough to matter [1]. Your weight still may not follow the average.
Weight began returning after treatment stopped. In STEP 4, people who kept taking the medicine lost more, while those moved to placebo regained weight [20]. After STEP 1, people regained an average 11.6 percentage points within a year [19]. The weight benefit didn’t last as well without treatment.
What Semaglutide changed in SUSTAIN-6 for the heart
SUSTAIN-6 followed 3,297 people with type 2 diabetes who faced a high chance of heart trouble. Semaglutide cut the combined chance of dying from heart disease, having a heart attack, or having a stroke by about one quarter [2]. The same trial tied quick sugar drops to more eye trouble among those with earlier eye damage [2]. Its report gave a 95% range around each finding because the exact size was unsure.
Another study followed 17,604 adults without diabetes to ask whether they would have fewer heart problems. All had heart disease, and their body mass index—a rough check using height and weight—was 27 or higher. With 2.4 mg, serious heart trouble was 20% less common than with placebo [3]. The report gave its own 95% range because the exact benefit is unsure; your risks and side effects still matter.
What Semaglutide did for damaged kidneys
The main kidney study followed 3,533 people with long-term damage from type 2 diabetes. One group received 1.0 mg of semaglutide each week. The other group didn’t get semaglutide; it received placebo.
Researchers grouped kidney failure, a 50% loss of the kidneys’ blood-cleaning work, or death from kidney or heart causes to see whether the medicine delayed grave kidney harm or death. That combined risk was 24% lower with semaglutide than with placebo [6]. The report gave a 95% range because the exact size of the benefit is unsure. Ask whether your kidney tests look like those of the people studied.
What Semaglutide did to blood sugar readings
Semaglutide copies GLP-1, a gut hormone, and was first used for high blood sugar. A review of the pill found lower readings on a blood test that shows your average sugar over about three months [11]. That wasn’t the only change; weight also fell. Heart benefits were about the same as with other GLP-1 medicines.
In SUSTAIN 7, semaglutide beat dulaglutide on both weight and the blood-sugar reading [12]. Dulaglutide is another weekly medicine for diabetes. A different study found 2.0 mg lowered the reading more than 1.0 mg [13]. That result supported a higher approved amount for diabetes, but it doesn’t mean the higher amount fits you.
What differed between Semaglutide and tirzepatide
Tirzepatide copies messages from two gut hormones, while semaglutide copies GLP-1 alone. The added one is called GIP; it helps release insulin after food and may also curb hunger. SURMOUNT-5 compared the medicines in 751 adults with obesity.
At 72 weeks, average weight fell -20.2% with tirzepatide and -13.7% with semaglutide. The gap was about 6.5 percentage points and was very unlikely to be due to chance [7]. For weight alone, tirzepatide went farther in this study.
Semaglutide has more study results so far for the heart, kidneys, and liver [3][6][8]. That fact can’t decide which medicine fits you. Ask how your health, time, cost, and side effects shape the choice.
What compounded Semaglutide studies did not test
Prescription access to semaglutide begins with a licensed clinician's decision, whether the medicine is FDA-approved or compounded. A compounded preparation has no FDA approval. Federal shortage rules allowed that work from roughly 2022 into early 2025. Officials tightened the rule after saying the shortage ended in 2025 [23].
The large STEP, SUSTAIN, SELECT, FLOW, and ESSENCE studies used the factory-made medicine. Those studies didn’t test medicine mixed by compounding pharmacies or other sellers. At your visit, ask which exact product is being discussed. Also ask what it may cost and how long you may need it.